[MERGE][#365865] Implement RemoteBranch.set_append_revisions_only.

[Andrew Bennetts]

This fixes a bug that was preventing “bzr init --append-revisions-only” from
functioning via HPSS.

In fixing this bug I've introduced a new bug, which is that if the remote
branch is an old format that does not support that flag then via HPSS you
will not get a message telling you to upgrade the branch.  This isn't ideal
but it's not a showstopper, and anyway is seems less important than making
it work for current formats, and fixing it properly (without introducing
more _ensure_real calls) would be significantly more effort.  I've added a
KnownFailure test for this.

I also updated the UI message when an upgrade is required — suggesting
“--experimental-branch6” is a bit out-of-date!

-Andrew.

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